There was definitely a change a few patches ago. My iksar necro spent all his training points (a fair amount of plat involved) in levelling research up to 120ish.
I always thought on live that it was similar to tradeskills like blacksmithing/tailoring where after 26 or so you'd have to work at it yourself.
To try and work it up, the best places to look for enchanter pages are probably druid ring vendors, cities, etc. Don't forget to check all Highkeep vendors on the 1st floor and around the bank.
The alternative is quite time consuming. Get a "Concordance of Research" either by handing in a greater lightstone or checking the vendors in NK/Oasis and levelling up that way...but some of the "practice" components aren't easy to find
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